diff --git a/misc/plugin/estraier-register.rb b/misc/plugin/estraier-register.rb
index 907048c..32c8bd3 100755
--- a/misc/plugin/estraier-register.rb
+++ b/misc/plugin/estraier-register.rb
@@ -109,7 +109,7 @@ module ::TDiary
 			@plugin = ::TDiary::Plugin::new(
 							'conf' => @conf,
 							'cgi' => @cgi,
-							'cache_path' => cache_path,
+							'cache_path' => @io.cache_path,
 							'diaries' => @diaries
 							)
 			def @plugin.apply_plugin_alt( str, remove_tag = false )